Propeller.



No. 675,563. Patented June 4, I90l. K. G. JOHNSTON.

PROPELLEB.

(Application fllodoct. 19, 1900.)

(No Model.)

A ITEM/v5 rs Uwrrn STATES PATENT OFFICE.

KIRK GARDNER JOHNSTON, OF PIQUA, OIIIO.

PROPELLER.

SPECIFICACITION forming part of Letters Patent No. 675,563, dated June4, 1901. application filed October 19, 1900. Serial No. 33,616. (Nomodel.)

To (tZZ whom, it 71m concern/.-

Be it known that I, KIRK GARDNER J OHN- STON, a citizen of the UnitedStates, and a resident of Piqua, in the county of Miami and State ofOhio, have invented a new and improved Propeller, of which the followingis a full, clear, and exact description.

This invention relates to improvements in propellers for vessels; andthe object is to provide a simple means for shifting the angle of theblades and locking the same for propelling the vessel forward orbackward without reversing the direction of rotation of thepropeller-shaft.

I will describe a propeller embodying my invention and then point outthe novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a section on the line a; 00 of Fig. 2 of a propellerembodying my invention. Fig. 2 is a section substantially on the line 3y of Fig. 1; and Fig. 3 is a similar section to Fig. 2, but showing theparts in a reverse position.

Referring to the drawings, 1 designates the propeller-shaft, upon theouter end of which is mounted to slide longitudinallya sleeve 2. Forconvenience in assembling the parts this sleeve 2 is made in horizontalsections, which when assembled are secured together at the outer end bymeans of a nut 3, engaging With tapped extensions of the sections, andat the inner end by means of a nut 4, which also has screw-threadedengagement with a tubular shaft 5, surrounding the propeller-shaft andadapted to connect at its end within the vessel with a suitable meansfor moving said tubular shaft and the sleeve longitudinally of thepropeller-shaft. This means it is not deemed necessary to show herein.

The propeller-blades 6 (here shown as threein number) are provided withjournal portions 7, which have hearings in openings in the sleeve 2, asplainly indicated in Fig. 1. The inner ends of these journal portionsare provided with crank extensions 8, the wrist-pins 9 of which engagein channels 10, formed in the propeller-shaft 1. The portion of saidpropeller-shaft within the sleeve and within which these channels areformed is made angular in ci'osssection, providing fiat surfaces uponwhich the inner ends of the journals of the blades may ride. The bodyportions of the channels 10 are extended diagonally across the flatsurfaces of the shaft 1, and they terminate at the ends in extensions 1112, the side Walls of which are parallel with the axis of the shaft.These extensions 11 and 12 are designed to receive the wrist-pins 9 whenthe sleeve 2 is in either of its extreme positions, and the side Wallsof said extensions, being parallel with the axis of the shaft, willserve to lock the blades as angularly adjusted, Whereas should thechannels be diagonal from end to end it is obvious that a slightrotation of the shaft 1 relatively to the sleeve would cause adeflection of the blades.

In operation when the sleeve 2 is moved to its outer position, asindicated in Fig. 2, the propeller-blades will be deflected transverselyto the position to move the vessel forward as the propeller-shaft isrotated. WVhen it is desired to move the vessel backward, the sleeve 2is to be drawn inward on the propeller-shaft, so that the Walls of thechannels 10, engaging with the wrist-pins, Will reverse the trans- Eerse angle of the blades, as indicated in Having thus described myinvention, I claim as new and desire to secure by Letters Patent 1. In apropeller, a propeller-shaftprovided at its outer end with channels, thebody portions of Which are arranged diagonally, and terminate at theends in extensions the side walls of which are parallel with the axis ofthe shaft, a sleeve mounted to move longitudinally of the shaft, bladeshaving hearings in said sleeve, and crank wrist-pins on the bladesengaging in said channels, substantially as specified.

2. In a propeller, a propeller-shaft having its outer end made angularin cross-section providing flat surfaces, diagonally-disposed channelsin said flat surfaces, terminating in extensions having opposite Wallsparallel with the axis of the shaft, a sleeve made in longitndinalsections, means for secnring the secname to this specification in thepresence of tions together, propeller-blades having beartwo subscribingWitnesses.

ings in said sleeve, crank portions 0n sail blades, and wrist-pins 0nthe crank portions KIRK GARDNER JOHN STON' 5 for engaging in saidchannels, substantially Witnesses:

as specified. O. B. JAMISON,

In testimony whereof I have signed my L. H. ROUZER, J r.

